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Old 11-21-2006, 11:50 PM
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Rear Question

How can a 7.5 posi with 373 gears be "Beefed Up" to hold 550 - 600 HP?

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Old 11-22-2006, 07:52 AM
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Is this a GM rear end?
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Old 11-22-2006, 10:10 AM
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Yes this is a GM rear. Coming out of a Monte Carlo SS.
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Old 11-22-2006, 11:36 PM
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The only way a GM 7.5" rear is going to withstand a typical 600hp engine is to replace everything except the lube with something bigger.
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Old 11-23-2006, 06:22 AM
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I blew my 7.5 in my 86 cutlass with my a 300 (maybe) horse 350. It had 3.42 gears and posi with 255/65/15 rubber. When I took it apart all most of the spider gears were broke. The cure would be a better posi unit but then you would probably break a pinion or axle. Its not worth the money IMHO.
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Old 11-23-2006, 10:37 AM
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Well, how what would I replace to make it stronger or is there a better unit that will be able to withstand this much power? I'd rather do it once, the right way.
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Old 11-23-2006, 10:58 AM
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Google G-Body 9 Inch
Should see results from Moser, Currie, etc.
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Old 11-23-2006, 01:23 PM
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For a primer on stock rear ends and how much power they will support go to this article from Hot Rod magazine:

http://www.hotrod.com/techarticles/axle_rear_end_guide/
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